Yup, this partnership is more about providing demos and showing people in each of our respective communities how they can use the two services together. Fortunately both of our APIs were powerful enough already that we didn't have to write any additional library code to integrate the two
Because we're so heavily client-side, we created a policy-based security api to allow you to control the actions allowed using the filepicker.js library, as well as actions in your developer portal that you can use to make things read-only, set the max allowed file size, etc.
(I'm not trying to be down on what has been developed here - just trying to understand how it is different from what was already possible)